The shots, which look to have been taken at a private Chinese testing facility, first appeared on Chinese media but are now circulating widely on social media (as below).
But it's clear that underneath the camouflage, more radical design tweaks are on the cards, particularly at the rear, where striking angular light clusters replace the round items on today's car and are linked by a new piece of black trim that spans the width of the bootlid.
The front, too, is clearly distinguished from the current Mini range but retains the wide bar across its large grille and characteristic circular headlights.
What isn't immediately clear is whether Mini has taken steps to 'shrink' the fourth-generation hatch, as has long been reported to be the priority.
These shots only show the exterior from select angles but, as with the earlier official images, the indication is that the next generation will feature largely familiar proportions.
The leak also gives clues to Mini's new-era interior design ethos. True to form, the Mini hatchback features a large, round central display, although a head-up display looks to have taken the place of the conventional gauge cluster above the steering wheel, which adopts a new two-spoke design.
While the combustion-engined version of the next Mini hatchback, due in 2023, will be built in Oxford, the electric version is set to be made by BMW's Chinese joint venture partner Great Wall Motors.
The petrol variant will use the new front-driven FAAR architecture, which is essentially an evolution of the current car's UKL platform. Mini has yet to confirm or preview plans for a five-door version, but a convertible will be built in the UK from 2025.
A spokesperson for BMW UK refused to comment on the leaked images.